EP3352244B1 - Battery module comprising end plates having improved structure, and end plate member therefor - Google Patents

Battery module comprising end plates having improved structure, and end plate member therefor Download PDF

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Publication number
EP3352244B1
EP3352244B1 EP16873378.0A EP16873378A EP3352244B1 EP 3352244 B1 EP3352244 B1 EP 3352244B1 EP 16873378 A EP16873378 A EP 16873378A EP 3352244 B1 EP3352244 B1 EP 3352244B1
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EP
European Patent Office
Prior art keywords
plate member
end plate
battery module
frame
openings
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
EP16873378.0A
Other languages
German (de)
French (fr)
Other versions
EP3352244A4 (en
EP3352244A1 (en
Inventor
Bum-Kyung SEO
Yong-Seok Choi
Jin-Hak KONG
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
LG Chem Ltd
Original Assignee
LG Chem Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by LG Chem Ltd filed Critical LG Chem Ltd
Priority to PL16873378T priority Critical patent/PL3352244T3/en
Publication of EP3352244A1 publication Critical patent/EP3352244A1/en
Publication of EP3352244A4 publication Critical patent/EP3352244A4/en
Application granted granted Critical
Publication of EP3352244B1 publication Critical patent/EP3352244B1/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0481—Compression means other than compression means for stacks of electrodes and separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0468—Compression means for stacks of electrodes and separators
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
    • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
    • H01M50/211—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for pouch cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/238—Flexibility or foldability
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
    • H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/258—Modular batteries; Casings provided with means for assembling
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
    • H01M50/262—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks
    • H01M50/264—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders with fastening means, e.g. locks for cells or batteries, e.g. straps, tie rods or peripheral frames
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Definitions

  • the present disclosure relates to a battery module, and more particularly, to a battery module having a structure in which end plates are coupled to a cell assembly including a plurality of cells, and an end plate member therefor.
  • a battery module includes a plurality of cells connected in series and/or in parallel.
  • the battery module is typically produced in a shape shown in FIG. 1.
  • FIG. 1 illustrates a battery module including a cell assembly 10 including a plurality of cells arranged in a direction, and a case 20 having end plates 21 capable of surrounding the cell assembly 10.
  • the margin causes an increase in module size and thus may not serve as a proper solution.
  • a technology of suppressing expansion of a battery module by providing rigid end plates at two sides of a cell assembly is commonly used.
  • cell lifetime e.g., the state of health (SOH)
  • SOH state of health
  • Japanese Patent Publication No. 2005-108693 discloses a battery pack capable of preventing changes in the location of the center of laminated cells and the location of electrode terminals by absorbing of a thickness variation of the laminated cells based on elastic transformation of an elastic part when the thickness variation occurs due to a variation in the internal pressure of the laminated cells.
  • Korean Patent Publication No. 2007-0025734 discloses a secondary battery module capable of preventing bending deformation due to volume expansion of unit batteries, by providing bent parts on end plates of the secondary battery module.
  • the present disclosure is designed to solve the problems of the related art, and therefore the present disclosure is directed to providing a battery module having a structure capable of allowing expansion of end plates when the battery module is swollen and of limiting maximum displacement of the end plates, and an end plate member therefor.
  • a battery module including a cell assembly including a plurality of cells arranged in a direction, and an end plate member configured to cover at least an outermost side of the cell assembly in the cell arrangement direction, wherein the end plate member has the rigidity of steel and comprises a pair of end plates configured to cover two outermost sides of the cell assembly in the cell arrangement direction to fix the cells, and an upper plate configured to connect the pair of end plates, wherein the end plates include two or more openings configured as holes bored in a thickness direction of the end plate, and a frame part located between neighboring openings and having rigidity, wherein the frame part includes a first frame extending from a lengthwise center of the end plate member in a height direction of the end plate member, and one opening is provided at each of the two sides of the first frame, and the openings are symmetrically provided at two sides of the first frame.
  • the frame part may include a second frame extending perpendicularly from the first frame in a length direction of the end plate member, and the openings may be symmetrically provided above and under the second frame.
  • the openings may be provided by rectangular holes extending in a length direction of the end plate member.
  • an end plate member configured to cover an outermost side of a cell assembly in a cell arrangement direction and including two or more openings configured as holes bored in a thickness direction of an end plate, and a frame part located between neighboring openings.
  • FIG. 3 is a perspective view showing the main configuration of a battery module according to an embodiment of the present disclosure.
  • the battery module includes a cell assembly 100, and an end plate member 110 having end plates 111 configured to cover two ends of the cell assembly 100.
  • Each cell of the cell assembly 100 has a thin plate-shaped body and is preferably configured as a pouch-type secondary battery. A plurality of cells are arranged in a direction to configure a stacked structure.
  • the end plate member 110 includes a pair of front and rear end plates 111 configured to cover two outermost sides of the cell assembly 100 to fix the cells, and an upper plate 112 configured to connect the pair of end plates 111.
  • the end plate member 110 serves to provide mechanical rigidity for the cell assembly 100 and to protect the cell assembly 100 from external impact or the like.
  • the end plate member 110 may be made of a metal material such as steel.
  • the end plate member 110 includes two or more openings 120 configured as holes bored in a thickness direction of the end plates 111, and a frame part 121 located between neighboring openings 120.
  • the openings 120 are provided by rectangular holes extending in a length direction of the end plate member 110.
  • the frame part 121 includes a first frame 121a extending from a lengthwise center of the end plate member 110, which corresponds to a location of maximum displacement occurring when the battery module is swollen, in a height direction of the end plate member 110.
  • the openings 120 are symmetrically provided at two sides of the first frame 121a to symmetrically distribute the location of maximum displacement to two lengthwise sides of the end plates.
  • the frame part 121 includes a second frame 121b.
  • the second frame 121b extends perpendicularly from the first frame 121a in the length direction of the end plate member 110.
  • the openings 120 adjacent to the second frame 121b are symmetrically provided above and under the second frame 121b. According to this configuration, a location of maximum displacement of the end plate member 110 may be distributed in four directions.
  • an opening 120 is provided at each of the two sides of the first frame 121a.
  • the upper plate 112 connects and integrates top parts of the pair of end plates 111. Additionally, a plurality of through-holes 113 may be provided in the upper plate 112 at predetermined intervals along the length direction of the end plate member 110 to effectively distribute stress.
  • the battery module when a battery module is swollen, expansion of an end plate member may be allowed to an appropriate level. As such, the battery module may have rigidity and long lifetime.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Battery Mounting, Suspending (AREA)

Description

    TECHNICAL FIELD
  • The present application claims priority to Korean Patent Application No. 10-2015-0175244 filed on December 9, 2015 in the Republic of Korea.
  • The present disclosure relates to a battery module, and more particularly, to a battery module having a structure in which end plates are coupled to a cell assembly including a plurality of cells, and an end plate member therefor.
    • BACKGROUND ART
  • In general, a battery module includes a plurality of cells connected in series and/or in parallel. The battery module is typically produced in a shape shown in FIG. 1. FIG. 1 illustrates a battery module including a cell assembly 10 including a plurality of cells arranged in a direction, and a case 20 having end plates 21 capable of surrounding the cell assembly 10.
  • However, when the battery module is swollen due to cell overcharge or the like, the cell assembly 10 is deformed and, at the same time, the end plates 21 at two sides thereof bulge and expand outwards as illustrated in FIG. 2.
  • Although an inner margin of the battery module may be previously ensured in consideration of the expansion problem, the margin causes an increase in module size and thus may not serve as a proper solution.
  • Alternatively, a technology of suppressing expansion of a battery module by providing rigid end plates at two sides of a cell assembly is commonly used. However, when expansion of the battery module is forcibly suppressed, cell lifetime (e.g., the state of health (SOH)) may be reduced. That is, expansion should be allowed by a certain degree and lateral maximum displacement due to the expansion should be limited.
  • As a technology related to swelling of a battery module, Japanese Patent Publication No. 2005-108693 discloses a battery pack capable of preventing changes in the location of the center of laminated cells and the location of electrode terminals by absorbing of a thickness variation of the laminated cells based on elastic transformation of an elastic part when the thickness variation occurs due to a variation in the internal pressure of the laminated cells.
  • Korean Patent Publication No. 2007-0025734 discloses a secondary battery module capable of preventing bending deformation due to volume expansion of unit batteries, by providing bent parts on end plates of the secondary battery module.
  • US9083029 , US2013/224547 , US 4065603 disclose battery packs in housings.
  • In spite of the disclosure of the above technologies, a technical means capable of allowing a certain degree of expansion of end plates due to swelling and of controlling lateral displacement of the end plates due to the expansion to an appropriate level has not been disclosed and thus a solution thereto is required.
    • DISCLOSURE Technical Problem
  • The present disclosure is designed to solve the problems of the related art, and therefore the present disclosure is directed to providing a battery module having a structure capable of allowing expansion of end plates when the battery module is swollen and of limiting maximum displacement of the end plates, and an end plate member therefor.
    • Technical Solution
  • In one aspect of the present disclosure, there is provided a battery module according to the set of claims, including a cell assembly including a plurality of cells arranged in a direction, and an end plate member configured to cover at least an outermost side of the cell assembly in the cell arrangement direction, wherein the end plate member has the rigidity of steel and comprises a pair of end plates configured to cover two outermost sides of the cell assembly in the cell arrangement direction to fix the cells, and an upper plate configured to connect the pair of end plates, wherein the end plates include two or more openings configured as holes bored in a thickness direction of the end plate, and a frame part located between neighboring openings and having rigidity, wherein the frame part includes a first frame extending from a lengthwise center of the end plate member in a height direction of the end plate member, and one opening is provided at each of the two sides of the first frame, and the openings are symmetrically provided at two sides of the first frame.
  • The frame part may include a second frame extending perpendicularly from the first frame in a length direction of the end plate member, and the openings may be symmetrically provided above and under the second frame.
  • The openings may be provided by rectangular holes extending in a length direction of the end plate member.
  • In another aspect of the present disclosure, there is also provided an end plate member according to the set of claims of a battery module, the end plate member configured to cover an outermost side of a cell assembly in a cell arrangement direction and including two or more openings configured as holes bored in a thickness direction of an end plate, and a frame part located between neighboring openings.
    • Advantageous Effects
  • According to the present disclosure, when a battery module is swollen due to cell overcharge or the like, expansion of end plates may be allowed to an appropriate level. As such, rigidity may be ensured and a reduction in cell lifetime may be prevented.
    • DESCRIPTION OF DRAWINGS
  • The accompanying drawings illustrate a preferred embodiment of the present disclosure and together with the foregoing disclosure, serve to provide further understanding of the technical features of the present disclosure, and thus, the present disclosure is not construed as being limited to the drawing.
    • FIG. 1 is a perspective view showing the appearance of a battery module according to the prior art.
    • FIG. 2 is a cross-sectional view schematically showing an example in which the battery module of FIG. 1 is swollen.
    • FIG. 3 is a perspective view showing the main configuration of a battery module according to an embodiment of the present disclosure.
    • FIG. 4 is a perspective view showing the main configuration of a battery module according to another embodiment of the present disclosure.
    MODE FOR DISCLOSURE
  • FIG. 3 is a perspective view showing the main configuration of a battery module according to an embodiment of the present disclosure.
  • Referring to FIG. 3, the battery module according to an embodiment of the present disclosure includes a cell assembly 100, and an end plate member 110 having end plates 111 configured to cover two ends of the cell assembly 100.
  • Each cell of the cell assembly 100 has a thin plate-shaped body and is preferably configured as a pouch-type secondary battery. A plurality of cells are arranged in a direction to configure a stacked structure.
  • The end plate member 110 includes a pair of front and rear end plates 111 configured to cover two outermost sides of the cell assembly 100 to fix the cells, and an upper plate 112 configured to connect the pair of end plates 111. The end plate member 110 serves to provide mechanical rigidity for the cell assembly 100 and to protect the cell assembly 100 from external impact or the like. In this regard, the end plate member 110 may be made of a metal material such as steel.
  • The end plate member 110 includes two or more openings 120 configured as holes bored in a thickness direction of the end plates 111, and a frame part 121 located between neighboring openings 120.
  • The openings 120 are provided by rectangular holes extending in a length direction of the end plate member 110.
  • The frame part 121 includes a first frame 121a extending from a lengthwise center of the end plate member 110, which corresponds to a location of maximum displacement occurring when the battery module is swollen, in a height direction of the end plate member 110. The openings 120 are symmetrically provided at two sides of the first frame 121a to symmetrically distribute the location of maximum displacement to two lengthwise sides of the end plates.
  • In the end plate member 110, to increase the effect of distributing the location of maximum displacement, the frame part 121 includes a second frame 121b. The second frame 121b extends perpendicularly from the first frame 121a in the length direction of the end plate member 110. In this case, the openings 120 adjacent to the second frame 121b are symmetrically provided above and under the second frame 121b. According to this configuration, a location of maximum displacement of the end plate member 110 may be distributed in four directions.
  • According to the invention, when the end plate member 110 includes only the first frame 121a as illustrated in FIG. 4, an opening 120 is provided at each of the two sides of the first frame 121a.
  • The upper plate 112 connects and integrates top parts of the pair of end plates 111. Additionally, a plurality of through-holes 113 may be provided in the upper plate 112 at predetermined intervals along the length direction of the end plate member 110 to effectively distribute stress.
  • When the above-described battery module according to an embodiment of the present disclosure is swollen due to cell overcharge or the like and thus maximum displacement occurs at the lengthwise center of the end plate member 110, deformation such as deflection may be suppressed by the first frame 121a having a high rigidity and may be distributed to the adjacent openings 120 having a lower rigidity.
    • INDUSTRIAL APPLICABILITY
  • According to the present disclosure, when a battery module is swollen, expansion of an end plate member may be allowed to an appropriate level. As such, the battery module may have rigidity and long lifetime.

Claims (3)

  1. A battery module comprising:
    a cell assembly (100) comprising a plurality of cells arranged in a direction; and
    an end plate member (110) configured to cover at least an outermost side of the cell assembly in the cell arrangement direction,
    wherein the end plate member has the rigidity of steel and comprises a pair of end plates (111) configured to cover two outermost sides of the cell assembly in the cell arrangement direction to fix the cells, and an upper plate (112) configured to connect the pair of end plates,
    wherein the end plates comprise two or more openings (120) configured as holes bored in a thickness direction of the end plate, and a frame part (121) located between neighboring openings and having rigidity,
    wherein the frame part comprises a first frame (121a) extending from a lengthwise center of the end plate member in a height direction of the end plate member and the openings (120) are symmetrically provided at two sides of the first frame (121a).
  2. The battery module of claim 1, wherein the frame part comprises a second frame extending perpendicularly from the first frame in a length direction of the end plate member, and
    wherein the openings are symmetrically provided above and under the second frame.
  3. The battery module of claim 1 or 2, wherein the openings are provided by rectangular holes extending in a length direction of the end plate member.
EP16873378.0A 2015-12-09 2016-12-09 Battery module comprising end plates having improved structure, and end plate member therefor Active EP3352244B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PL16873378T PL3352244T3 (en) 2015-12-09 2016-12-09 Battery module comprising end plates having improved structure, and end plate member therefor

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR1020150175244A KR102154361B1 (en) 2015-12-09 2015-12-09 Secondary battery module improved in end plate structure and end plate member for the same
PCT/KR2016/014432 WO2017099513A1 (en) 2015-12-09 2016-12-09 Battery module comprising end plates having improved strucutre, and end plate member therefor

Publications (3)

Publication Number Publication Date
EP3352244A1 EP3352244A1 (en) 2018-07-25
EP3352244A4 EP3352244A4 (en) 2018-10-24
EP3352244B1 true EP3352244B1 (en) 2020-04-29

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP16873378.0A Active EP3352244B1 (en) 2015-12-09 2016-12-09 Battery module comprising end plates having improved structure, and end plate member therefor

Country Status (7)

Country Link
US (1) US10586960B2 (en)
EP (1) EP3352244B1 (en)
JP (1) JP6650516B2 (en)
KR (1) KR102154361B1 (en)
CN (1) CN108140774B (en)
PL (1) PL3352244T3 (en)
WO (1) WO2017099513A1 (en)

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KR102330872B1 (en) * 2018-09-20 2021-11-23 주식회사 엘지에너지솔루션 Battery module, battery pack comprising the battery module, and vehicle comprising the battery pack
CN208955070U (en) * 2018-11-15 2019-06-07 宁德时代新能源科技股份有限公司 Side plate and battery modules
KR102396437B1 (en) * 2019-06-25 2022-05-09 주식회사 엘지에너지솔루션 Battery module and battery pack including the same
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Also Published As

Publication number Publication date
PL3352244T3 (en) 2020-08-10
CN108140774A (en) 2018-06-08
WO2017099513A1 (en) 2017-06-15
CN108140774B (en) 2020-10-16
EP3352244A4 (en) 2018-10-24
US20180287116A1 (en) 2018-10-04
KR20170068261A (en) 2017-06-19
KR102154361B1 (en) 2020-09-09
JP2018530890A (en) 2018-10-18
JP6650516B2 (en) 2020-02-19
EP3352244A1 (en) 2018-07-25
US10586960B2 (en) 2020-03-10

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